joseph



April 14, 1925. Re. 16,043

H. F. JOSEPH INTERNAL GRINDING MACHINE Original Filed Aug, 7, 1920 5Sheets-Sheet 1 BY ,gwmw

ATTORNEYS April 14, 1925.

H. F. JOSEPH INTERNAL GRINDING MACHINE Original Filed Aug. '7. 1920 5Sheets-Sheet 2 ATTORNEYS Ap 14-, 1925. v H. F. JOSEPH 1 INTERNALGRINDING MACHINE Original Filed Aug. 7, 1920 5 Sheets-Sheet 4 INVENT RATTORNEYS April 14, 1925. H. F. JOSEPH INTERNAL GRINDING MACHINEOriginal Filed Aug. 7, 1920 5 Sheets-Sheet 5 n% m g Q INVENTOR I 2452 BYA ATTORNEYS a but also to wash away the detritus.

Reissued Apr. 14, 1925.

sTATE 1 PATIENT I OFFICE.

HARRY r. :rosnrn, or nAvnNro-nr, IOWA, AssfGNoR, 'BY MEsltE Assremvmn'r's, 'ro MICRO MACHINE-COMPANY, or ZBETTENDORF, owa, aoonrona'rron or IOWA.

INTERNAL-GRINDING MACHINE.

, I Original No. 1,396,123, dated November 8, 1921 ,'Seria1 No. 401,088,filed'August 7, 1920. Application for 1 reissue filed September 7, 1923.Serial No. 661,534.

To all whom it may concern:

Be it known that I, HARRY citizen of the United States, residin atDavenport, in the county of Scott and State of Iowa,have inventedcertain new and useful Improvements in Internal-Grinding Macl1ines,.ofwhich the following is a specification, reference being had to theaccompanying drawings.

This invention has relation to that type of grinding machines in whichthe grinding-wheel spindle is not only rotated axially but is given anorbital movement to cause the grinding-wheel while rapidly rotating tofollow the contour of a cylindrical surface. During the operation of themachine, the spindle and the wheel are in addition given a feedingmotion, i. e., a step-by-step movement either radially inward orradially outward, according to whether the wheel is operating upon anexternal surface or an internal surface. I haveshown and describedmechanism for imparting this feeding action to the spindle and thegrinding-wheel, but this mechanism is covered by my copending divisionalapplication, Serial No. 506,300.

The present invention has relation to means for maintaining a continuoussupply I of water to the oint of attrition, to thereby not only keep t ewheel and the work cool It has been known for sometime that this wetgrinding is advantageous, but no one has ever succeeded in practicallyapplying it to.

the type of grinder hereinbefore described. It is the object of thepresent invention to provide a simple and efiicient means formaintaining a continuous stream of water at the grinding-point ofsu'fiicient force and as to always maintain the volume to keep the wheeland the work cool and at the same time wash away'the grit, so

- clean, whereby I am enab ed not only to perform the grinding operationeconomically but also to obtaln avery high degree of smoothness andrecision in the work, as more fully hereina er set forth.

Other objects will-appear in the course of the following description.

- My invention is illustrated in the accompanying drawings, whereinFigure 1 is a side elevation of an internal F. JosnPH, a

inding-surface grinding machine constructed in accordance with myinvention;

chine;

Fig. 3 is a fragmentary vertical sectional View through the housing 10and a portion of the base B taken on the line 33 of Fig. 4; a i

Fig. 4 is a detail rear elevation of the housing and bearings for thespindle;

Fig. 5 is a fragmentary vertical sectional view through the rear end ofthe spindle and the bearings therefor showing the water ducts insection;

Fig. 6 is a fragmentary longitudinal sectional view through the forwardend of the spindle and the grinding wheel mounted thereon Fig. Fig. 6;

' Fig. 8 is a section on the line 88 of Fig. 3 but showing the spindlein its lowermost position;

Fig. 9 is a sectional view on the line 99 of Fig. 8;

Fig. 10 is a top plan view of the construction shown in Fig. 8;

Fig. 11 is a sectional View on the line l111 of Fig. 10;

Fig. 11 is a fragmentary elevation, look: ing rom the rear of thefeeding mecha nism illustrated inFig. 8;

Fig. 12 is a detail elevation partly in section of the joint between thespindle members 24 and 37;

Fig. 13 is a section on the line 1313 of Fig. 12;

Fig. 14 is an elevation of the guard 102 in applied position, thespindle housing being broken away;

Fig. 2 is a rear end elevation of the ma- 7 is a section on the line 7-7 of Fig. 15 is a detail side elevation of the 1 shifted longitudinallyof the table, transversely of the table, or rotated relative to which isprovided intermediate its ends with the gear 11. This cylindricalcarrier is provided at its ends with the inwardly directed,

annular flanges 12 and 13 forming bearings for a spindle housing 14.This member may be rotated by any suitable mechansm,

but I have illustrated for this purpose a shaft 15 carryinga pinion orgear wheel engaging the gear wheelll and driven by a belt or sprocket.chain'16, in turn operating over a belt wheel or sprocket wheel 17carried upon the shaft 18 driven by a sprocket chain 19 from a sprocketwheel 20 on a motor shaft 21, the motor being designated 22. I do notwish to be limited, however, to the particular means for driving themember 10. This member is entirely inclosed within the housing formed bythe column B and the cap) B thereof.

isposed within the cylindrical carrier 10, as previously stated, is; thespindle housing 14, which is annular inflcross section, and this spindlehousing 14, as indicated clearly in Fig. 4, is eccentrically-disposedwith relation to the carrier 10 so that as this carrier 10 rotates inthe "direction of thearrow in Fig. 4, the spindle housing will becarried bodily around the axis a, and it will be seen from Fig. 3 thatthis spindle housing 14 has a passage 23 which is eccentric to theperiphery of the spindle housing. Extending through this passage 23 is aspindle, desig nated generally 24, and'which, as illustrated,

is composed of the two sections. This spindle is considerably longerthan the spindle housing and projects beyond the spindle housing both'atits forward and rear ends. Extending from the body-14 of the spindlehousing is the front spindle housing 25 within which the forward portionof the spindle 24 is disposed and in which it is. rotatably mounted. 24is mounted in exteriorly conical bearings 26', (see Fig. 6) while that.portion of the spindle coincident with the rear end of the forwardspindle housing 25 ismounted in bearings 27 which are likewise conical.

The forward end of the housing 25 is screw-threaded, and engaged therwith is a ccliar 28 having an annular flange 29 ex- The forward end ofthe spindle tending over the end of the bearing 26 and by rotating thiscollar it is obvious that the wear on the hearing may be taken up. The

spindle is reduced at this point, as at 30, and surrounding the reducedportion of this spindle and bearing against the forward flange 29 ofcollar 28 and extending over the forward portion ofthis collar 28 is .adust cap 31 which rotates with the spindle 24. Surrounding the body ofthe dust cap .31 is the grinding Wheel 32 which may be The extremity ofthe spindle 24 is screw-- threaded, and engagingthis screw-threadedportion is a nut 34 having radially extend-, ing, relatively shallowpassages 35, (see Fig. 7)- and riveted to this nut is a plate 36. The sindle has a longitudinally extending bore 3 by which water is suppliedto the grinding wheel, and this bore' flares toward its forward end and"discharges water into the radial ducts 35 and by these radial ducts thewater is discharged against wheel 32 and. carried outward by centrifugalaction against the work. i

The rear end of the spindle 24 projects beyond the cylindrical housing14. This housing 14 is cut out at its rear end to receive certainball'bearings, as will be later stated, and mounted upon the spindle 24are the two connected driving pulleys 38 and 39 which are keyed orotherwise connected to the spindle 24 to rotate therewith. i The ballbearing for the support ofthe rear end of the spindle may be of anysuitable construction, and as illustrated in Fig. '5 comprises an innermember 40, the outer annular mem ber 41, and the intermediateanti-friction element, such' as anti-friction balls. This ball bearingis held in place by means of a jam nut 42 exteriorly threaded to engagethe inte rior threads on the recess formed in the rear end of thehousing 14, as most clearly illustrated in Fig. 5. The rearendof thehousing 14 is exteriorlyj screw-threaded for engagement by the nuts 43,whereby the housing is held in proper relation to the rotatable carrier10, which has an annular. plate 10 attached to'it by screws and againstwhich the nuts 43 bear, the forward end of the housing section 14 havinga flange 44 which bears against the split ring 43*. The

nuts 43 pull the spindle housing 14 against' the split ring 43 onthe'forward end of the spindle housing and push the rear split ring 43against end flange .plate 10. This insures perfect hearing at all times.Thus,

the housing section 14 is supported for "relatively" rotary movementwithin the rotatable carrier 10 and the spindle is supported forrotation around its own axis within the housings 14 and 25. Preferablythis spindle is .formed in two sections, as shown."

with a' central, conical boss'4'7 seating yvithin the end of the othersection, and these" two parts-being held from relative rotation by pins'48. The two sections are held together by a flexible couplingmember 49hav ing a flange-to engage over the head 46 and being interiorlyscrew-threaded to. engage over the screw-threads 45. This couplingmember is held in placeby a jam nut 50.

It will be noted from Fig. 12 that the exterior face of the boss 47 issli htly curved or struck on a radius andthatt ierea-r face of theshoulder 46 also has a curve corresponding to the radius of thecurvature on the outer face of the boss 47 to thereby allow forflexibility in the coupling at this point, the pins 48 being relativelyloose-in the sockets formed in the part'24 to permit this.

At its rear end, the spindle carries means whereby it may be connectedto a water sup-' ply pipe and to a pipe forcarrying off excess water,and to this end, as illustrated in Fig; 5, the bore 37 at the-rear endof the spindle is flared, as at. 51, and this rear end of the spindle isexteriorily screw-threaded. Surrounding the rear end of the spindle is'ahollow head 52 which is interiorly screwthreaded at its rear end, anddisposed within this screw-threaded ortion of the head is a housing nut53 which is annular and carries a conical nozzle 54. This conical ortapered end is disposed within theflared rear end 51 of the bore 37,this nozzle being provided with ashoulder disposed between the nut 53and the rear end of the spindle. Surrounding and rotating with thespindle 24 are the internal bearing members 55 and 56 separated by aninternal spacing collar 57.

'Balls or other anti-friction elements 58 surrouncb the bearing members55 and 56 and roll against the outer bearin members 59 and 60 which fitwithin the outer bearing members 59 and 60. The bearing members 55 and56'with the collar 57 are forced-against the conical projecting end 39of'the pulley 39 by means of a nut 62 engaging the screw-threaded rearend of thcspindle 24. The rear extremity of the nozzle 54 projects outbeyond the nut 52 and I is exteriorly screw-threaded for engagement.water would be forced into the ball bearings.

and 52. The' central, outer spacing collar 61 separates the The water ispreferthe' n1eans. .whereby housingor'head may be carried off, thisout,-' p let branch 65-connectingtoa flexible pi e' .67. It will, ofcourse, be obvious. from the above description that the spindle canrotate .freely within the housing 14 and'withinthe head or-housing 52and with reference-to [the nozzle 54, andthat water maybecontinuouslysupplied to the port of the spindle it and that overflowwill be carried ofl' from the branch 66. The overflow passes out throughthe. space between the extremity of the nozzle 54 and the flared end 51of spindle Should there I be no overflow space" This overflow alsoallows drainage when. supply of Water is cut off.

In order to:.p rovide means whereby .the

grinding wheel may beadjusted toward-or from the axisa around which thegrinding wheel rotates to thereby finelyadjust the depth of cut, Iprovide means whereby the housing-section 14and the housing section 25with it may be axially rotated. To this end, I mount upon the forwardend of the carrier lOjan approximately annular, plate 68 (see Figs. 3and 8) having an eccentrically disposed. circular opening 69 which fitsover the flange .44 of member 14 and which is provided with a marginalflange 70 fitting'over an, annular rabbet or recess formed in theforward endofthe carrier 10. This plate 68 carries at. one point on itsperiphery a bearing bracket 71 supporting a shaft 72 which, at itsrear-end, carries a,

ratchet wheel 73, having radially projecting teeth. The opposite end ofthis shaft 72 carries a worm 74. This worm meshes with a worm wheel 75loosely mounted on a shaft 76'carried in bearings 77' on the plate 68.One face of the worm wheel 7 5 carries upon it the clutch teeth 78, andcoacting with these clutch teeth is a clutch member 7 9 mounted upon theshaft 76. A coiled com.- pression sprin 80 bears against one of thebearing lugs 7 and against-a collar 81 car-' ried by the shaft 76 sothat normally the clutch member 79. is urged into engagement with theclutch teeth 78 and thus the worm wheel 75 is clutched to the shaft .76.This shaft between the bearing members 77-carries a worm 82, and at oneextremity carries keyed to shaft 76 by key 82".

Coacting with the ratchet wheel 73, as

will be later described, and mounted upon thehousing section B and,therefore, held stationary relative to the rotation of plate i therelatively long arm of the'lever, and the- 68 and bracket 71 is anupwardly projecting bracket 86 having two passages for the twolongitudinally shiftable pins 87 and' 88 (see Figs. 10 and 11); T] ewalls of the pin pasface extending downward and toward the left in Fig.8. Either of these cams is adapted to be manually projected into activeposition by pressing on the appropriate knob 91, but is normallyretracted by the spring 92 and held thereby out of active position.

Mounted upon the shaft 72 rearward of the ratchet wheel 73 is a pawlcarrying lever 110. This. lever is'rotatable with relation to the shaft72 and isheld in place by the screw 111. The ratchet wheel 7 3 is, ofcourse, fast on shaft-72. This lever projects laterally from its'a-xisin one direction to form outer end of this arm is provided with arearwardly projecting pin 112 carrying a roller 113,..as shown best inFig. 11, which roller is adapted, as the plate 68 is rotated, to engagewith whichever cam 108 or 109 is projected. This lever 110 carries uponit the substantially. triangular pawl 114, which is triangular in: formto provide the oppositely projectinglteeth 115 and 116 engageable withthe ratchet wheel 73. The apex of the triangular pawl'is engaged by aspring pressed pin 117, urged toward the pawl by a spring 118, as shownin Fig. 10. The extremity of this pin 117 is rounded and bears aainst-the rounded apex of the pawl and yleldingly holds the pawl in oneor the other of its active ositions. The opposite extremity of the ever110 is formed with a re-' entrantly'angled face 119, and disposed on abracket or lug 120 projecting from the bearing member 71 is a springprojected pin 121 projected toward the angular face 119' of: the leverby means of a spring 122. Ex-

tending from the bracket 71 and specifically from the bearing portion ofthis bracket is a lug or extension 123 having a forwardly projecting lug124 constituting a stop. The base of this bracket 71 is also formed witha forwardly projecting lug 125-constituting a stop. The pawl 114: isadapted to engage "with one or the other of these steps. Thus, forinstance, referring to Fig. 11, when the pawl carrying lever 110 movesdownward beyond a certain point, the tooth 116 of the pawl 114 willstrike the stop 125 and this will shiftthe pawl 114 so as to bring itstooth 116 in engagement with the teeth of the ratchet wheel 73 and bringthe tooth 1.15 out of engagement with the teeth of the r'atchetwheel 73.On theother hand, if the tooth 116 is engaged with the ratchet wheel73then upon 'an upward movement of the roller carrying end of the lever114 beyond a certain point,.fthe tooth 115 will strike the stop 124'andthe osition of the pawl will be reversed. It wil be seen that when theoperator presses upon one or the other of the pins 87 or 88,thecorresponding cam 108 or 109 will be projected into the line of rotationof roller 113, this roller being carried around with the plate'G'S andwith the main hearing. The roller strikes and glides upon thecorrespondingeam, and when it is struck the in one direction, thusgiving a partial revo- -lut1on to the ratchet wheel 73 andgivingapartial rotation to the worm 74. This being engagedwith worm gear 75,revolves the wormgear, which in turn revolves the worm 82 and the wormgear wheel 84, thus making an adjustment of the, emery wheel cut bymoving the worm gear wheel 8-1 which is attached eccentrica-lly to therear spindle housing, said housing supporting the front spindle housing25. After the roller 112 has traveled over the cam, as for instance thecam 108, and has moved off this cam, the lever 110 is brought'back toits neutral position by-spring' plunger 121. Vhen a reverse adjustmentofthe feed is required, the operator forces out earn 109, for instance andthe roller 113 will move over the upper face of this cam, thus shiftingthe lever in the opposite direction and thus feeding the ratchet wheelin the opposite direction and feeding the spindle oppositely. The pinwhich has been shifted to the proper position to operate the cam 108will, of course, need to be shifted to a reverse position in order to 0p'erate the cam 109. and when the operator carries the cam ,109 intoposition to engage the roller,the tooth 115 of pawl 11.4 will strike thestop 124, thus throwing the pawl .into opposite center of the springplunger 117 and causing the tooth 116 to engage the ratchet teeth. Ifthe pawl strikes the ram 108, a reverse action takes place and thedepression of the lever will cause the pawl to strike the stop 125 andthe pawl will again be reversed; Thus the pawl is kept in one positionor the other until the opposite cam llh ' up wear. To this end, thefront plate 68 is attached to the carrier or main bearing 10 by means ofcap screws 93 passing throu h slots 9% in the plate 68. Attached to t eplate 68 by means of a screw 95 is an eyebolt or adjusting screw 96,through the eye of which the screw 95 passes, the shank being threaded.This screw-threaded shank 96 passes through a stud 97 which is screwed vin the end of the carrier or main bearing10.

. justed position by thelock nut 98' and the- The screw 96, of course,passes loosely through the perforation in the stud 97 and on each sideof thisstud are disposed the. knurled nuts 98 and 99. By" releasing thecap screws 93, the front plate 68 can be drawn around circumferentiallyby turning the knurled nut 99, which action draws the worm 82 intodeeper mesh with the: worm gear 84. After the desired adjustment hasbeen made, the parts are locked in their adcap screws 93.

It will be noted that the pivotal axis of the bearing plate 68' is eui-distant from the axis of rotation of the axis of rotation of thespindle 24, thus permitting theaxis of the spindle 21 to be located incoincidence with the axis of the housing.

It will be seen from Figs. 1 and 2 that the flexible pipes 64 and 67extend downward through slot 100 which is formed in a yoke 101 which isrotatably mounted in and projects from the housing wall formed by the,supporting column B. This yoke 101 is a freely oscillatable yoke andthus takes care of the independent eccentric action of the head or elbow52 and permits the free movement of the pipes 64 and 67 renderednecessary by this eccentric action ,of the various parts.

The workcarriage. C may be of any suit able design or character and isprovided with means whereb it may be longitudinally shifted towar orfrom the grlnding wheel and the work raised or lowered, or the workturned into any desired angle with the axis of the grinding Wheel. Ofcourse, it will be understood that other work supporting means may beused in connection with the movable feed table,D, and for various kindsof Work, as for instance, rods,

spindle housin ousing 10 and the pins, cylinder s,pistons, etc., andthat where rods or pinsare tobe ground, the rod or p n or other workwill be rotated and car'- r1er 10 will be'idlev while spin(lle '2& willrotate around the axis d, and that the same is true of grinding theexterior of a "cylinder or piston, but that .Wheninterior work is to beground, the grindingwheel is dis posed within the hollow article andrevolves,

around the central. axis (1. Where external grinding is being done, aguard, such as Shown in Fig. 14, will be used; This guard 102 isapproximately semi-circular in form and embraces the grinding wheel andis pro vided with a shank portion 103 having clamps whereby it may beengagedwith the This guard is preferably in two halves hinged togetherand is clamped.

upon the main spindle housing 25 in any desired position. Water willstrike the guard and be thrown off upon the "revolvir 1 work. The pumpwhich supplies water 50 the spindle is controlled by a knob 104 which,when shifted inward, throws the ptunp out of gear when the water supplyis not desired, and which, when pulled outward, throws the pump intogear. A lever 106 (see Fi 1) is used for shifting the clutch (not s own)which allows for throwing idle the main bearin 10,-that is for causingpower to be transmitted to this main bearing 10 or carrier. The throwingof this main bearing 10 idle does not, of course, stop the revolution ofthe spindle carrying emery wheel. The lever 107 is used for changing thespeeds ofthe movable f base I). he

clutch mechanismcontrolled by the lever Y 106 and *the means for'securin variable speeds of the table D havernot trated, as it' is notbelieved fn'eces'sa'ry,as

glass-parts are more or lessold well i Ifhavenot shown in detail themeans for operating-the work support to thereby feed the work nor have Ishown any means for controlling the speed of the various shafts or therotating I speed of the'spindle, or the speed of revolution of thespindle and its grinding wheel around the central axis a, as these maybe'of any desired and' obvious contruction.

The general operation of this mechanism will be obvious from what hasgone, before.

The article to be ground or o erated on is supported on the movable worsupport and adjusted to the proper position, and the carrier or mainbearing 10. is then rotated through the gear 11 and at the same time thespindle is rotated through the pulleys 38 or 39. When grindinginternally,'t he spindle will be rotated, rotating with it the grindingwheel and at the same time the grinding wheel and spindle will movebodily around the axis a. By the'meansheretofore described, the spindleand rinding centrifu a1 force against the face of the may be shiftedradially outward or inward, as desired, either automatically by forcingin one or the other of the pins 87 or 88, or by disconnecting the clutch7 9 the feed may be rapidly controlled by means of the wheel 83. Thefeeding means which I have de-' vised provides for an extremely fineadjustment of the feed capable of feeding the cut in fractions ofthousandths of an inch while the machine is runnin The particularconstruction of the grin ing wheel and the means for su'pplging waterthereto provides cool. Obviously other liquids than water mi ht be usedif desired.

" hile I have illustrated a constructionwhich has been found thoroughlyefiectivo for the purpose intended, yet It will be obvious that manymodifications might be made in the details. of construction and ar-.

rangement of arts without departing from the spirit of t e invention.

I claim:'- r 1. In. a mechanism of the character described, a tubularspindle a grinding wheel mounted thereon and having a rec ess in one endface, anut engaging the'spindle and bearing against th grinding wheeland dis- .osed in said recessed end face, the outer ace of said nuthavin radially extendin grooves, and a baflle p ate attached to said nutand extending over said recesses therein.

2. In a mechanism of the character described; a tubular spindle'reducedat one end having an exterior screw-threaded ex-. tremity, the bore ofthe spindle flaring toward its extremit, a grinding wheel surroundingthe' re uced extremity of the spindle and, having a recess in its outerend face, and a nut engaging the screwth-readedextremit of the spindleand disposed within said recess, said nuthaving radial discharge ductscommunicating with the bore of the spindle, and a baflle late attachedto the face of said .nut and mming the outer wall of the said ducts.

3. In a mechanism of the character described, a tubular,rotatablejspindle, a hollow head into which the end of the spindleextends, bearings mounted in said hollow head supporting the spindle, anozzle carried in the hollow head and projecting loosely into the boreofthe spindle, and a supply pipe connected to the nozzle.

4. Inia mechanism of the character describedfga tubular, rotatablespindle, a hollow head into which the end ofthe spindle extends,bearings mounted in said hollow head supporting the spindle, a nozzlecar ried in the hollow head and. rojecting loosely into the bore of thespin e, a supply pipe connected to the nozzle, and a discharge pipeconnected to the head, the 'head having ducts communicating withv theinterior of the spindle to carry-oil the excess liquid.

5. In a. mechanism of the character described, a tubular rotatablespindle, bear.

ings supporting the spindle, a fixed hollow head into which the rear endof the spindle projects and open at its opposite ends, antifrictionbearing elements dis sed within the hollow head and supporting the rear'end of the spindle, a plug detachably closing the rear end of the head,a nozzle carried bysaid plug and discharging into-the bore of thespindle, and a tubular water connection. operatively enga ed with thenozzle.

6. In a mechanism 0 the charatcer described, a tubular rotatablespindle, bear ings in which the spindle is mounted, a hollow head intowhich the rear extremity of the spindle projects and having an inturnedflange at its forward end, an outer ball race disposed against saidflange within the head, an inner ball race mounted on the spindle,anti-friction elements. disposed be tween the races, inner and outerspacing sleeves abutted a 'ainsttheraces, an inner and outer racedisposed against the rear ends of the, spacing. sleeves, anti-frictionmembers disposed between said races, a nut on aging the rear extremityof the spindle an bearing against the inner rearmost race,- a plu havingscrew-threaded engagement with t e rear end of the head and having acentral aperture, the lug being hollowed out 'to form a circumerentially extending chamber surrounding said nut and having a;discharge duct leadlng from said chamber,

a nozzle rotatably mounted in the openin" of. the lug and confrontingthe rear en of the spindle and discharging thereinto,

, the nozzl and rear end of the spindle being need from each other topermit the diss c arge of water through said ace .into said chamber andduct, and a. ho] ow water supply member engaged with the rear end ofsaid spindle. j

7. A .mechanism of the character described including a tubular spindle,a grinding wheel mounted thereon for rotation" therewith, means formovin the spindlev bodily through a circular pat eccentric to the axisof the s indle, means at the rearend of the spind e for forcing waterinto and through the tubular s indle, and means at the rear ehd of thespindle for carrying oil excess water. 8. A mechanism of the characterdescribed including a tubular spindle, a grinding wheel mounted thereonfor rotation therewith, means for moving the spindle off excesswater,"said means including flexible pipes and a' swivelly mounted yokethrough which the pipes pass.

9. In a machine for grinding lnternal 1 cylindrical recesses, arotatable drum and means for driving it, aspindle journaled in said drumeccentric to the axis thereof whereby the rotation of the drumwillimpart a bodily rotation to the spindle, means for axially rotating saidspindle at a relatively high speed while bodily rotating, agrinding-wheel carried .by said slpindle, means for continuously forcingliqui along said spindle and delivering it at the grinding-wheel-endthereof, and means for delivering the liquid by centrifugal force at arelatively great velocity against the cylin- (irical i ace of the work.

10. In a mechanism of the character described, a rotatable drum andmeans for driving it, a tubular spindle journaled eccentrically in saiddrum so as to rotate bodily therewith, means for giving said spindle anindependent axial rotation at a relatively high speed while bodilyrotating, a grinding whcel on said spindle, means for continuouslyforcing li uid through said spindle, an outlet for the liquid beingprovided at the grindiug-wheel-end of the spindle, and means fordeflecting the liquid against one face of said grinding-wheel, wherebysaid liquid is projected outwardly therefrom by centrifugal force at arelatively great velocity against the internal'face of the work.

11. In a mechanism of the character described, a rotatable drum andmeans for driving it a tubular spindle journaled eccentric-ally in saiddrum so as to rotate bodily iherewith, means for giving said spindle anindependent axial rotation at a relatively high speed while bodilyrotating, a grinding-wheel on said spindle, means for con tinuouslyforcing liquid through saids indle, an outlet for the liquid beingprovide at the grinding-wheel-end ofthe spindle, and means fordeflecting the liquid against one face of said grinding-wheel, wherebysaid liquid is projected outwardly therefrom by centrifugal force at arelatively great velocity against the internal face of the work, saiddeflecting means being located in arecess in one face of thegrinding-wheel.

12. In 'a machine for grinding internal cylindrical recesses, a tubularspindle mounted for rotation on its own axis and for bodily rotation onan axis eccentric thereto, a grinding wheel carried by said spindle andhaving a recess in one end face surrounded by an imperforat'e annularwall, means in said recess having radlal passages to conduct streams ofliquid against said annular wall whereby the liquid will flow over theface of said wheel and be projected a ainst the wall of the cylindricalrecess, sai passages having their inner ends in communication with theinterior of the tubular spindle, and means for supplying liquid to theinterior of the spindle.

13. In a mechanism of the character described, a rotatable drum andmeans for rotating it, a tubular spindle eccentrieally journaled in saiddrum so as to bodily rotate therewith, means for giving said spindle anindependent axial rotation at relatively high speed while bodily-rotating, a grindingwheelon said spindle, and means for continuouslydelivering liquid to the inlet-end of said tubular spindle during itsbodily rotation and axial rotation, said means for continuouslydelivering the liquid embodying a nozzle having te escopic relation withthe inlet-end of the tubular spindleand a housing 'or head enclosing thenozzle and mounted for bodily movement with the spindle.

14. In a mechanism of the character described, ,a rotatable drum andmeans for rotating it, a tubular spindle eccentrically journaled in saiddrum so as to bodily rotate therewith, means for giving said spindleanindependent axial rotation at relatively high speed while bodilyrotating, a grinding-

